The scrotum is a "heating" and "cooling" air conditioner.

A man's scrotum is an air conditioner that can "heat" and "cool". The spermatogonia in the testis can produce tens of millions of sperm a day. However, if the temperature is too high, it not only can not maintain the balance of nutritional supply, but also destroys the activity of reactive enzymes that produce sperm, so in order to produce mature sperm, it must be kept at a temperature of 2 ℃ ~ 4 ℃ lower than body temperature. If the temperature is too high, spermatogenesis will be hindered, or even completely stopped; too low temperature will affect the development and survival of sperm. Skin contraction: a portrayal of mood swings the scrotum can dissipate heat or keep warm through folds in order to maintain the appropriate temperature for the testicles, but the contraction of the scrotal skin cannot be understood so simply. Because hot and cold is not the only factor in scrotum contraction, the scrotum is directed by the emotional center or autonomic nerve center located inside the brain. Fear, tension, anger and sexual excitement can also cause the scrotum to contract, lift or droop dildo hero , which truly reflects a man's psychological activity. On the contrary, when men are depressed and depressed, the scrotum will also show "listlessness". As a result, when men are sick or weak because of aging, the scrotum appears to be more "cowardly". Tell an interesting story: a famous foreign baseball coach uses scrotum contraction to confirm the pitcher's nervousness. He squeezed the pitcher's crotch tightly before the pitcher was in place. if it was a contraction of the scrotum, then the pitcher must not be sure to pitch well. Therefore, scrotal contraction can also be said to be a measure of physical tension. The testicle in the scrotum is a delicate organ that cannot be hit, touched or pinched. In daily life, if our scrotum is suddenly impacted or impacted remote vibrator , we will immediately feel unbearable pain. This is because the testicles are covered with a thin white membrane, which stretches a part instantly due to a sudden impact or impact, so the nerves on the membrane feel severe pain, which is no less severe than the pain felt when kicking on the internal organs. Although the testicles feel painful, they don't get hurt easily. According to a friend who works as a medical examiner in the Public Security Bureau, victims of torn penises are often seen in many traffic accidents, but few testes are injured. It turns out that the testicles have a defensive response to trauma, and once they are aware of danger chastity device , they shrink into it, just like a tortoise withdraws its head into its carapace. Dark epidermis: the color of a person's skin depends on a variety of pigments, including the amount of melanin, the thickness of the skin and the contraction and relaxation of blood vessels. The important factor that affects skin melanosis is sex hormone. Whether men or women, all the more sensitive parts of the sexual organs, the concentration of sex hormones is higher, such as nipples and areola, scrotum, labia, etc. adult toys for men , especially after shrinking and thickening. There are also folklore: people who have dark lips (that is, heavy pigmentation) have strong sexual desire. If you take a closer look, you may also find that the nipple and the surrounding circle of the adult man's nipple is quite black, while the underage's nipple is pink; the adult man's scrotum is black, while the little boy's scrotum is similar to the surrounding skin tone. This pigmentation does not occur until puberty. All these phenomena are due to the fact that these areas are stimulated by sex hormones for a long time, resulting in a large amount of melanin deposition. Surface wrinkles: spermatogonia in air-conditioned testicles that can be "heated" and "cooled" can produce tens of millions of sperm a day. However, if the temperature is too high, it not only can not maintain the balance of nutritional supply, but also destroys the activity of reactive enzymes that produce sperm, so in order to produce mature sperm, it must be kept at a temperature of 2 ℃ ~ 4 ℃ lower than body temperature. If the temperature is too high, spermatogenesis will be hindered, or even completely stopped; too low temperature will affect the development and survival of sperm. Scrotal skin is sensitive to external temperature. The fold of the scrotum happens to assume the role of "air conditioning equipment" for heat dissipation and heating. Whenever winter comes, cold air stimulates the smooth muscle of the meat membrane and the muscle of the orchis to contract, raising the position of the testis, and the scrotum quickly tightens into dense folds until it is retracted to the perineum to prevent heat dissipation and help to keep warm. If you just enter the water swimming, because the water temperature is lower than the body temperature, the same phenomenon will happen. After entering the summer, due to the increase in external temperature, the smooth muscle and the clonorchium muscle stretch to the maximum, making the testicles drop as far as possible, far away from the body, the skin of the scrotum is relaxed, and the density of folds is reduced, thus increasing the heat dissipation area and conducive to local heat dissipation. At the same time, the arteries in the spermatic cord are wound around the parallel venous plexus, and the blood in the two vascular systems flows backwards only through the thin vascular wall, forming a countercurrent exchange system. The venous blood constantly takes away the heat from the arterial blood in the abdominal cavity. As a result, the blood temperature of the testicular artery is 5.2 ℃ lower than that of the abdominal aorta. Nowadays, many young people like to wear jeans to show their free, easy and rugged beauty, but they do not realize that the crotch is tight and the cloth is thick, which is not conducive to emitting heat. It is said that the crotch temperature is sometimes as high as 40 ℃. Such a high temperature destroys the temperature regulation of the scrotum and may cause the death of a large number of spermatozoa, which is difficult to conceive if the dead sperm exceeds 50%.
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